David L. Jones wrote:
> I'm after some reasonably priced mains RFI filters of the type you
> can simply plug inline with an existing power cord or power point. A
> decent power board variety would be OK too.

Have a look through the "Silicon Chip" web site. They published such a
design a few years ago but I don't recall the date. I seem to remember
that it was supposed to be "reasonably effective" for RF. Haven't used
one myself but I do have a commercial single phase filter in series with
my sinewave inverter (I'm on solar power) which seems to be of a similar
topology and it cuts the RFI down to manageable levels on the HF
amateur radio bands.
Alan

A cheap mains filter would be one from an old hoover front loading
washing machine. The filters on these are designed to filter out harsh
commutator noise from the brush AC/DC motor. They work well for
computers and they look like an AC capacitor used for Cap type started
motors. All four wires are used. Two AC power in, two filtered power out.
A proper filter setup will cost you around $80 to $100 or more. This one
beats em all.